How check if a value == 1 while is waiting 120 secs?

I mean,i want that,while the script is waiting: wait (120),check if Mision.Value == 1,if it is while the time is running,send a message,this is the script

while true do
if workspace.Mision.Value == 1 then 
	
	
local c2 = Instance.new ("Message")
c2.Text = "Gas Station Call"
c2.Parent = game.Workspace
c2.Text = "All clear"


else  	
	wait (120)
end

end